Lateral area of a cone with oblique base (elliptical base)

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Can someone help me find the lateral area of a straight circular cone with oblique base ( inclined elliptical base) as seen at the following link.

http://chestofbooks.com/crafts/metal/Sheet-And-Plate-Metal-Work/Elliptical-Cone-Or-Cap.html#.U1bRC9w3cpE

Thanks a lot!!